/**
 * Copyright (c) 2015-2017, Winter Lau (javayou@gmail.com).
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.oschina.j2cache.ehcache;

import java.util.Arrays;
import java.util.Collection;
import java.util.Map;
import java.util.stream.Collectors;

import org.ehcache.config.ResourceType;
import org.ehcache.event.CacheEvent;
import org.ehcache.event.CacheEventListener;
import org.ehcache.event.EventFiring;
import org.ehcache.event.EventOrdering;
import org.ehcache.event.EventType;
import org.ehcache.expiry.Duration;

import net.oschina.j2cache.CacheExpiredListener;
import net.oschina.j2cache.Level1Cache;

/**
 * <p>
 * EHCache 3.x 的缓存封装
 * </p>
 * <p>
 * 该封装类实现了缓存操作以及对缓存数据失效的侦听
 * </p>
 *
 * @author Winter Lau(javayou@gmail.com)
 */
public class EhCache3 implements Level1Cache, CacheEventListener {

	private String name;
	private org.ehcache.Cache<String, Object> cache;
	private CacheExpiredListener listener;

	public EhCache3(String name, org.ehcache.Cache<String, Object> cache, CacheExpiredListener listener) {
		this.name = name;
		this.cache = cache;
		this.cache.getRuntimeConfiguration().registerCacheEventListener(this, EventOrdering.ORDERED,
				EventFiring.ASYNCHRONOUS, EventType.EXPIRED);
		this.listener = listener;
	}

	@Override
	public long ttl() {
		Duration dur = this.cache.getRuntimeConfiguration().getExpiry().getExpiryForCreation(null, null);
		return dur.getTimeUnit().toSeconds(dur.getLength());
	}

	@Override
	public long size() {
		return this.cache.getRuntimeConfiguration().getResourcePools().getPoolForResource(ResourceType.Core.HEAP)
				.getSize();
	}

	@Override
	public Object get(String key) {
		return this.cache.get(key);
	}

	@Override
	public void put(String key, Object value) {
		this.cache.put(key, value);
	}

	@Override
	public Map get(Collection<String> keys) {
		return cache.getAll(keys.stream().collect(Collectors.toSet()));
	}

	@Override
	public boolean exists(String key) {
		return cache.containsKey(key);
	}

	@Override
	public void put(Map<String, Object> elements) {
		cache.putAll(elements);
	}

	@Override
	public Collection<String> keys() {
		return null;
	}

	@Override
	public void evict(String... keys) {
		this.cache.removeAll(Arrays.stream(keys).collect(Collectors.toSet()));
	}

	@Override
	public void clear() {
		this.cache.clear();
	}

	@Override
	public void onEvent(CacheEvent cacheEvent) {
		if (cacheEvent.getType() == EventType.EXPIRED) {
			this.listener.notifyElementExpired(name, (String) cacheEvent.getKey());
		}
	}

	@Override
	public void clearExpiryKeys() {
		// TODO Auto-generated method stub

	}
}
